We are Guangzhou Hongda Steel Tube Co., Ltd, which is specialized in produce and sales of steel tubes. Our main products are below:(1) seamless carbon steel pipe: standard: ASTM A53, A106, API 5L, A179, A192, A519, DIN1629, DIN17175, DIN2391, etc material: Gr.B, SAE 1010, SAE 1020, SAE 1035, SAE 1045, St 37.0, St 35.8, etc O.D.: 1/2--12'' , W.T.: sch10-sch160 (2) seamless stainless steel pipe: standard: ASTM A312/312M, ASTM A213/213M, ASTM A269, JIS G3459,DIN17456, DIN 17458, EN 10216-5 etc material: TP304/304L, TP316/316L, TP321, 316Ti,1.4301, 1.4306, 1.4541, 1.4401,1.4404, etc O.D.: 4--325mm, W.T.: 0.5-25mmIf you need steel tubes, please don't hesitate to contact us. Thank you.